设计师降低了图片的饱和度，使整体色调更加柔和。

The designer applied ___desaturation to the image to make the overall tone more subtle.

医生注意到患者运动后血氧饱和度迅速下降。

The doctor observed rapid ___desaturation in the patient's blood after exercise.

为了营造复古效果，设计师对照片进行了轻微的降低饱和度处理。

To create a vintage effect, the designer applied slight ___desaturation to the photo.